Toyota Sienna Service Manual: Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

The meter CPU receives engine coolant temperature signals from the ECM via the multiplex communication lines. The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: If there is an open or short in the engine coolant temperature sensor circuit, the ECM will store the DTCs.

Perform troubleshooting of the "SFI System"

1 CHECK MULTIPLEX COMMUNICATION SYSTEM

1. Check if the MULTIPLEX communication DTC is output

Result

2 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.
2.  Turn the ignition switch to the ON position.
3.  Turn the tester ON.
4.  Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / ACTIVE TEST.
5.  Check the operation by referring to the values in the table below.

METER:

OK: Needle indication is normal.

3 READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.
2.  Turn the ignition switch to the ON position.
3.  Turn the tester ON.
4.  Enter the following menus: DIAGNOSIS / ENGINE / DATA LIST.
5.  Check the values by referring to the values in the table below.

ENGINE:

4 REPLACE COMBINATION METER ASSEMBLY

OK: The operation of the combination meter assembly returns to normal.

END